There was a bug that might cause this behavior in an early version. If you did not download the installer from this site or if you have downloaded it right after the release in June, then please try downloading it again, uninstalling the old, and installing the new version.
If the problem persists, please send the cursor (to info@rw-designer.com) and an exact guide how to reproduce the error. In the meantime, you can simply increase the time of the last frame instead of replicating it.